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Kernel/PCI: Remove InterruptDisabler usage

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Instead, just ensure we pick the m_access_lock and then m_scan_lock when
doing a scan/re-scan of the PCI configuration space so we know nobody
can actually access the PCI configuration space during the scan.

The m_scan_lock is now a Spinlock, to ensure we cannot yield to other
process while we do the PCI configuration space scanning.
This commit is contained in:
Liav A 2021-10-22 20:43:33 +03:00 committed by Andreas Kling
parent 72e831e9e9
commit 8e55c4bfaf
Notes: sideshowbarker 2024-07-18 01:58:21 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/8e55c4bfaf9
Pull-request: https://github.com/SerenityOS/serenity/pull/10577
2 changed files with 7 additions and 6 deletions
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10
Kernel/Bus/PCI/Access.cpp
View file

@ -8,7 +8,6 @@
#include <AK/HashTable.h>
#include <Kernel/API/KResult.h>
#include <Kernel/Arch/x86/IO.h>
#include <Kernel/Arch/x86/InterruptDisabler.h>
#include <Kernel/Bus/PCI/Access.h>
#include <Kernel/Debug.h>
#include <Kernel/Firmware/ACPI/Definitions.h>
@ -40,7 +39,6 @@ UNMAP_AFTER_INIT bool Access::initialize_for_memory_access(PhysicalAddress mcfg_
if (Access::is_initialized())
return false;
InterruptDisabler disabler;
auto* access = new Access(Access::AccessType::Memory);
if (!access->search_pci_domains_from_acpi_mcfg_table(mcfg_table))
return false;
@ -307,7 +305,8 @@ u32 Access::read32_field(Address address, u32 field)
UNMAP_AFTER_INIT void Access::rescan_hardware_with_memory_addressing()
{
MutexLocker locker(m_scan_lock);
MutexLocker locker(m_access_lock);
SpinlockLocker scan_locker(m_scan_lock);
VERIFY(m_device_identifiers.is_empty());
VERIFY(!m_domains.is_empty());
VERIFY(m_access_type == AccessType::Memory);
@ -330,7 +329,8 @@ UNMAP_AFTER_INIT void Access::rescan_hardware_with_memory_addressing()
UNMAP_AFTER_INIT void Access::rescan_hardware_with_io_addressing()
{
MutexLocker locker(m_scan_lock);
MutexLocker locker(m_access_lock);
SpinlockLocker scan_locker(m_scan_lock);
VERIFY(m_device_identifiers.is_empty());
VERIFY(m_access_type == AccessType::IO);
dbgln_if(PCI_DEBUG, "PCI: IO enumerating hardware");
@ -456,7 +456,7 @@ UNMAP_AFTER_INIT void Access::enumerate_bus(int type, u8 bus, bool recursive)
void Access::fast_enumerate(Function<void(DeviceIdentifier const&)>& callback) const
{
MutexLocker locker(m_scan_lock);
MutexLocker locker(m_access_lock);
VERIFY(!m_device_identifiers.is_empty());
for (auto& device_identifier : m_device_identifiers) {
callback(device_identifier);

3
Kernel/Bus/PCI/Access.h
View file

@ -11,6 +11,7 @@
#include <AK/Vector.h>
#include <Kernel/Bus/PCI/Definitions.h>
#include <Kernel/FileSystem/SysFS.h>
#include <Kernel/Locking/Spinlock.h>
namespace Kernel::PCI {
@ -82,7 +83,7 @@ private:
// General Data-members
mutable Mutex m_access_lock;
mutable Mutex m_scan_lock;
mutable Spinlock m_scan_lock;
Bitmap m_enumerated_buses;
AccessType m_access_type;
Vector<DeviceIdentifier> m_device_identifiers;